When Does a Star Become a Main-Sequence Star

question 137

Multiple Choice

When does a star become a main-sequence star?

• A) when the protostar assembles from its parent molecular cloud
• B) the instant when hydrogen fusion first begins in the star's core
• C) when the rate of hydrogen fusion in the star's core is high enough to sustain gravitational equilibrium
• D) when a star becomes luminous enough to emit thermal radiation
• E) when hydrogen fusion is occurring throughout the star's interior

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